ABOUT THIS IMAGE. This image illustrates the 203 configurations of identity and nonidentity possible among the six alleles at a locus in three diploid individuals.
Each dot represents an allele, each pair of dots in a row represents a diploid individual, and a line connecting two dots indicates that two alleles are identical by descent. The figure is inspired by the work of DeGiorgio et al. (Unbiased estimation of gene diversity in samples containing related individuals: exact variance and arbitrary ploidy; Genetics 186: 1367-1387). In the article of DeGiorgio et al., it was important to compute sums that considered all of the identity configurations possible for sets of four individuals.